Question

10. Santosh obtained 70 marks out of 90 in Mathematics. Find the percentage of marks
obtained by Santosh in Mathematics.
11. 1,600 kg of mortar coaltar of 60% sand, 30 % cement and rest lime. What is the mass of
lime in coaltar?
​

Answer 1

Answer:

10.

TOTAL MARKS = 90 MARKS

MARKS OBTAINED = 70 MARKS

% OF MARKS OBTAINED = MARKS OBTAINED/TOTAL MARKS × 100

= 70/90×100

= 77.7 %

11.

TOTAL MASS OF COALTAR = 1600 KG

MASS % OF SAND = 60%

MASS % OF CEMENT = 30%

MASS % OF LIME = 100-60+30

= 10%

MASS OF LIME = 10% OF 1600

= 1600×10/100

= 160 KG

Answer 2

ꜱᴄᴏʀᴇᴅ ʙʏ ꜱᴀɴᴛᴏꜱʜ :- 70 ᴍᴀʀᴋꜱ

ᴛᴏᴛᴀʟ ᴍᴀʀᴋꜱ :- 90

⇒ ᴘᴇʀᴄᴇɴᴛᴀɢᴇ ᴏꜰ ᴍᴀʀᴋꜱ ꜱᴄᴏʀᴇᴅ ʙʏ ꜱᴀɴᴛᴏꜱʜ

= 70/90 × 100

= 7/9 × 100

= 700/9

= 77.7 % [ ᴀɴꜱ ]